Description
4000mAh High-Capacity 26650 Lithium Iron Phosphate (LFP) Cylindrical Battery | ATOMFAIRCOMMERCIAL GRADE · PRODUCTION
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TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official institutional quotations.
EMAIL: inquiry@atomfair.com
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Manufacturer: Atomfair LLC
Brand: ATOMFAIR®
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This 4000mAh 26650 LFP cell requires operation within a strict voltage window of 2.5V to 3.65V to prevent damage and ensure cycle life. It must be used with a dedicated LFP battery management system for cell balancing, especially in high-voltage series configurations.
- Voltage Window Constraint: Operate cells between 2.5V and 3.65V to prevent over-discharge or over-charge.
- Temperature Range Constraint: Charge only between 0°C and 45°C, and discharge only between -20°C and 60°C.
- BMS Requirement: Always use a dedicated LFP BMS with cell balancing for series strings.
- High Temperature Avoidance: Avoid sustained high-temperature operation to prevent accelerated degradation and thermal risk.
- Transport Safety: Use anti-static trays and insulated terminal covers for safe transport and storage.
Follow these steps to safely initialize and operate the 26650 LFP cell. Proper handling ensures maximum cycle life and prevents safety incidents.
Required Equipment: Dedicated LFP Battery Management System
- Connect BMS
Connect each cell to a dedicated LFP battery management system with cell balancing for series strings. - Set Charge Parameters
Set the charger to a constant voltage of 3.65V per cell and a current limit of 2C maximum. - Monitor Discharge Cutoff
Discontinue discharge when cell voltage reaches 2.0V to avoid over-discharge damage. - Control Thermal Environment
Charge cells only between 0°C and 45°C and discharge only between -20°C and 60°C.
How does depth of discharge affect the cycle life of the ATOMFAIR 4000mAh 26650 LFP cell?
At 100% depth of discharge (DOD) at 25°C, the cell delivers 2000 cycles. When cycled at 1C charge/discharge, which typically involves a shallower effective DOD, it achieves 6000 cycles. This trade-off allows users to prioritize either maximum energy throughput per cycle or extended cycle life by adjusting the operational DOD.
What balancing and BMS requirements are needed when using the 4000mAh 26650 LFP cell in high-voltage series strings?
The cell offers excellent cell-to-cell consistency suitable for series configurations, but the product documentation explicitly requires a dedicated LFP BMS with cell balancing for high-voltage series strings to maintain safe voltage limits and maximize cycle life. The recommended voltage window is 2.5V to 3.65V, and the BMS must enforce these limits during charge and discharge.
What are the safe operating and storage temperature ranges for the ATOMFAIR 26650 LFP cell, and what safety features does it include?
The cell can be charged from 0°C to 45°C and discharged from -20°C to 60°C. For maximum cycle life, avoid sustained high-temperature operation. It includes a built-in explosion-proof safety vent and passes nail penetration testing without fire or explosion, providing intrinsic thermal runaway protection under LFP chemistry.
The 4000mAh 26650 LFP cell achieves 142 Wh/kg with 6000-cycle 1C life and intrinsic safety features including nail penetration pass, but requires careful thermal management with a charge floor of 0°C and a dedicated BMS for series configurations.
Positive
- Highest capacity 26650 LFP cell: With 4000mAh nominal capacity and 142 Wh/kg energy density, this cell enables compact high-voltage packs for stationary storage and EV auxiliary systems.
- Exceptional cycle life and safety: Delivers 6000 cycles at 1C charge/discharge and passes nail penetration without fire or explosion, combining longevity with intrinsic LFP safety.
Trade-offs
- Limited charge temperature range: Charge operation is restricted to 0°C to 45°C; charging below 0°C may cause irreversible damage, requiring thermal management in cold environments.
- Requires dedicated LFP BMS: For high-voltage series strings, a BMS with cell balancing is mandatory to maintain cell consistency and maximize cycle life, adding system complexity.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
